I have been pondering the problem of my propshaft for some time now. For some reason the little screwed cap that holds the oil seal on the splined joint is way to big and hence impossible to screw up. I can only think that it has come loose at some point and years of rattling arround on the propshaft joint has stretched it. Its at least 3mm too big in diameter.
propshaft_problem by
Robin Martin, on Flickr
Anyway I was doing some routine maintenance on the Pembleton. The driveshafts (2cv) have 3 joints the centre one of which is a sliding spline like on a propshaft. They are all protected by rubber gaitors. So I got out the callipers and, would you believe it, the size of the shafts making up the splined joint is almost the same as that on the Marlin propshaft. Getting excited now... So I ordered a gaitor from ECAS, the main source for 2CV spares and it fits perfectly!
propshaft_solution by
Robin Martin, on Flickr
Not very often you get a piece of luck like that.